Which command is useful to find current user information in Linux/Unix

1.	Which command is useful to find current user information in Linux/Unix?
Answer» To find out which users are currently LOGGED in to your server or system, use the who command. The who command provides the following information: Last system boot TIME Current system run-level List of users logged in, etc. Syntax: $ who [options] [filename] Examples: No Option: If no option is specified, the who command DISPLAYS the following information for each user currently logged on to the system: The user's login name The user's login time The user's REMOTE hostname Terminal LINE numbers Command $ who Output user@host-0231:~$ whogourav pts/0 2021-03-10 17:04 (:0.0)sonia pts/1 2021-03-10 18:23 (:0.0) Option H: This option displays the headers of columns displayed by the who command. Command $ who -H Output user@host-0231:~$ who -HNAME LINE TIME COMMENTgourav pts/0 2021-03-10 17:04 (:0.0) Option whoami: This displays the actual username of the system. Command $ whoami Output gkuser@host-0231:~$ whoamigkuser

Which command is useful to find current user information in Linux/Unix?

Answer»

To find out which users are currently LOGGED in to your server or system, use the who command. The who command provides the following information:

Syntax:

$ who [options] [filename]

Examples:

No Option: If no option is specified, the who command DISPLAYS the following information for each user currently logged on to the system:
- The user's login name
- The user's login time
- The user's REMOTE hostname
- Terminal LINE numbers

Command

$ who

Output

user@host-0231:~$ whogourav pts/0 2021-03-10 17:04 (:0.0)sonia pts/1 2021-03-10 18:23 (:0.0)

Option H: This option displays the headers of columns displayed by the who command.

Command

$ who -H

Output

user@host-0231:~$ who -HNAME LINE TIME COMMENTgourav pts/0 2021-03-10 17:04 (:0.0)

Command

$ whoami

Output

gkuser@host-0231:~$ whoamigkuser